Machine for applying pressure to shoe bottoms



Nov. 1, 1 938.

V. H. MEYER I Filed May 21, 1937 3 Sheets-Sheet l MACHINE FOR APPLYINGPRESSURE TO SHOE BOTTOMS Nov. 1, 1938. v H. MEYER 2,134,726

MACHINE FOR APPLYING PRESSURE TO SHOE BOTTOMS Filed May 21, 1937 3Sheets-Sheet 2 Fig.2.

Nov. 1, 1938. v. H. MEYER 2,134,726

MACHINE FOR APPLYING PRESSURE TO SHOE BOTTOMS Patented Nov. 1,1938

UFNITED STATES P A TE- T QFFI Q E Vernon H; Meyer, Beverly, Mass,assignor to United Shoe Machinery Gorporation, Paterson, N. J., acorporation of New Jersey Application May 21,1937, Serial No; 144,005

The invention relates to cement. sole. attaching:

and sole. laying machines of the type inwhich pressure is applied to theshoe andi sole: by. hy-

draulic means operated; for'example, byoil under" pressure.

The invention is illustrated as embo'diedi in a machine of the typedisclosed in Letters Patent ofthe United States No.v 2,047,185 grantedvJuly. 14, 1936; upon application of Bal1ardiet al;,.whichr discloses amachine for" cement attaching soles".

to. shoes comprising a plurality of. pads which. are:

20. station should be maintained until the shoe: to:

which pressure has been applied: has& passed around the machine andhasarrived. at the station next to the operating station: where the:pressure is relieved. Under some circumstances, due sometimes toslightleakage inz'theivalvesan'd other mechanism by which the liquid is heldunder pressure and sometimes to compression of the work in response tothe heavy pressure to which it is subjected, the pressure on. the

liquid and hence onthe shoe may drop progressively so that a:substantial drop in the: pressure has occurred beforetheshoe arrives atthe station where the" pressure is'to be relieved.

Objects of this invention are to restore the pressure onthe shoes"already in the machine when. pressureis. applied. to the shoeat theoperating station but to avoid application of additional pressure to ashoe if the pressure thereon has been relieved or has: dropped below a.predetermined pressure; Accordingly, in the illustrated machine a pipelineleads: from the source of hydraulic pressure; for example oil underpressure; to each oi the cylinders by operation of the pistons in whichpressure is' applied: to the shoe. Each of thcse'pipe-lines has. a.valve: mechanism which will" permit oil to pass: from.

the source of: supply to a' cylinder as long as the the source of oilpressure to each of the cylinders, as fully disclosed in theabove-mentioned patent, which pipes are provided with three-positionvalves by whichadmission of" pressure into each cylinder, itsmaintenance therein and its exhaustion therefrom are controlled.

If one ormoreof the pads for any reason is not being used whiletheothers are' in use, it has beenfound that sometimes, due probably toleakage of the three-way valves pressure will gradually build up in theidle cylinder and may cause injury to the machine. Accordingly, theinvention consists further in the provision of a drain which preventsthe building up of pressure inian idle cylinder, the drain opening beingautomatically closed when pressure is applied to the cylinder. Asillustrated; the valve mechanism comprises a. plunger acting against aspring to close. the'drain; opening and at the same time to open apassage leading: from the source of oil' supply; The. plunger isoperated against its spring by the building up of pressure in thecylinder, the. rush of oil from the cylinder causing the plunger to beoperated against its spring, thus-opening an inlet from the source ofsupply; This condition is maintained, permitting oil from the: generalsource of supply to pass under pressure to the cylinder to restorepressure therein as' long as nearly the initial pressure is maintainedtherein. When a cylinder isexhausted or the pressure therein in any waygreatly reduced, the spring reacts, opening the drain and" closing thepassage from the source of supply so that pressure will not be admittedto the exhaust cylinder, but any oil accidentally entering thecylindermay pass out through the drain.

In the drawings- Fig. 1- is a planview showing three of the eightcylinders. of a sole-attaching machine of the type illustrated in saidBallard et al. patent with additional pipe lines leading from the sourceof pressure supply to all of the cylinders;

Fig. 2 is a front elevation of the machine. of Fig. 1 showingparticularly the arrangement of the pressure-applying mechanism;

Fig. 3 is a view in side. elevation of. one of the cylinders ofthemachine and thepressure-apply-- ing mechanism associated therewith,with the. pressure-restoring mechanism ofthe present inventionconnected'tothe cylinder; and

Figs. 4 and 5. are sectional views of the pressure restoring valvemechanism, Fig. 4 showing the parts in the positions they assume whenthe cylinders are exhausted and Fig. 5 showing. the

parts in the positions they assume when the cylinder is under pressure.

In the drawings, my novel mechanism for restoring pressure in thecylinders which are applying pressure to the work when pressure is beingapplied to the cylinder at the operating station is disclosed asembodied in a machine of the type fully disclosed in the above-mentionedpatent. The drawings of this application show only those parts of themachine with which my invention is concerned and for an explanation ofparts of the machine not herein fully described reference may be had tothe above-mentioned patent. 1

In the drawings, the numeral I0 (Figs. land 2) indicates a turretcarrying the pad boxes and arranged for rotation about a vertical axison a column I2. At each station there is a cylinder I4 (Fig. 4)containing a piston I6 upward movement of which, due to oil or otherliquid under pressure admitted through a pipe I8, acts through levers20, 22 (Fig. 3) pivoted at 24 to apply downward pressure to a shoe Alocated on a pad 26.

' .The oil pressure is produced by a continuously running pump 36 (Fig.2) which draws oil through a pipe 32 from a tank 34 and delivers itthrough a pipe 36 to the central portion of the turret I0 (Fig. 1) whereit is distributed through four pipes 38 to the eight cylinders, eachpipe 38 having two branches 40, 42, one going to a three-position valve44 of one cylinder and the other to the three-position valve 44 of thecylinder next to it. The three-position valve 44 r. (Fig. 2) may beoperated by a handle 48 which,

when moved to the right, allows the pressure liquid to pass through thepipe I8 to the cylinder I4, when in its central position holds thepressure in the cylinder, and when moved to the left permits thepressure liquid in the cylinder to be exhausted through a pipe 50 intothe column I2 from which it is returned to the tank 34 by a pipe 52. Thepipe 32 is connected to the pipe 36 by a by-pass pipe 54 in which is apressureinducing valve 56. When the valve 56 is opened the pump 30circulates liquid idly through the by-pass 54 but when the valve 56 isclosed pressure is built up in the pipe 36 and in the connections 38,40, 42 to each of the cylinders. The

pyalve 56 is closed by depression of a treadle 58 having a treadle rod60 which has operating connections at 62 with the valve 56 so thatdepression of the treadle will close the valve 56 and cause pressure tobe built up in the system. The

c rod 60 also carries a head 64 connected toa lever 66 fulcrumed at 68on the machine frame. The lever 66 carries a roll I0 which engages anarm I2 of a three-armed lever. Another arm I4 of the lever carries aroll I6 which engages the top of the head 64. The three-armed lever isfulcrumed at I8 on the turret and its third arm 80 is connected by alink 82 to the handle 48 of the three-position valve 44. It will be seenthat when the head 64 moves down by depression of the treadle 58 theroll I8 on the lever 66 will move upwardly against the arm 12 of thethree-armed lever, causing it to rotate in a clockwise direction to pullon the link 82, thus opening the threeposition valve to admit pressureto the cylinder at the operating station.

One arm 84 of an angle lever pivoted at 86 to the frame lies under theroll 16 of the threearmed lever located at the station next to theoperating station. A depending arm 88 integral -with the arm 84 carriesa roll engaging a cam slot 90 in a member 92 adjustably secured to thelever 66, the slot 90 being so formed that when the member 92 movesupwardly in-response to depression of the treadle the slot 90 will turnthe angle lever 84, 88 in a clockwise direction about its fulcrum 86,the arm 84 engaging the roll 16 of the three-armed lever at the nextstation to the operating station and rotating the lever in acounterclockwise direction to move the threeposition valve at thatstation into position to exhaust the pressure fluid from its cylinder.

Back of each cylinder I4 and connected thereto by a U-shaped pipe 94 isa pressure-restoring valve mechanism 96 which consists, as shown inFigs. 4 and 5, of a rectangular block in which are mounted a ball checkvalve 98, the ball of which is held to its seat by a light spring I0,and a plunger valve I02 the lower end I03 of which is conical. When theplunger moves downwardly, the conical end closes an opening into a draintube I04. The plunger I02 is normally held raised by a spring I06, asshown in Fig. 4, in which position a sleeve I08 mounted on the plungerbetween its head II 0 and the spring I06 closes a passage I I2 leadingto the ball valve 98. When the plunger I02 is depressed as shown in Fig.5, the sleeve I08 descends below the passage II2, leaving a passage opentherefrom to the pipe 94. On the plunger I02 above the head H0 is aflange II4 which limits upward movement of the plunger I08, and thesides of the flange H4 and the head IIO are slabbed off to permitpassage of fluid from the passage II2 to the pipe 94 when the sleeve I08is depressed and to permit drainage from the pipe 94 through the sleeveI08 and out through the drain tube I04 when the plunger I02 is raised.Leading from the ball check valve I00 is a pipe I I6 which is connected,as shown in Fig. 1, to the source of pressure supply. That is, the rearend of the pipe H6 is connected to a hollow plug II 8 which is threadedinto a hole in the head In of the turret to which pressure is suppliedby the pump 30. It will be noted that four of the pressurerestoringdevices 96 have their pipes II 6 connected to one plug I I8 and that onthe other side of the turret is another plug I I8 to which the otherfour pressure-restoring devices are connected.

Supposing pressure is being applied to a cylinder I4 at the operatingstation, the pressure fluid being admitted by the three-position valve44 through the pipe I8 to the cylinder and passing through the pipe 94of the pressure-restoring devices, the rush of oil through the pipe 94forces the plunger I02 down against its spring I06 and seats the conicalend I03 in the passage into the drain pipe I04, the plunger remaining inthis position (Fig. 5) so long as the high initial pressure in thecylinder, which may be over- 400 pounds per square inch, does not dropbelow a predetermined pressure which may be as low as 50 pounds. Whenthe cylinder I4 just filled has moved away from the operating stationand. another cylinder is having pressure applied thereto, the samepressure will be conducted by the pipe II6 through the check valve 98 tothe pipe 94 and, if the pressure has dropped, it will be restored. Whenthe cylinder reaches the eighth station, that is, the one next to theoperating station, the three-position valve ofthat cylinder will bemoved to the exhaust position and the pressure will drop in thatcylinder below say fifty pounds, whereupon the plunger I02 of thepressure-restoring mechanism 96 connected with that cylinder will berelieved of the pressure upon it sufliciently to be raised by its springI96, opening the drain tube Hi4 and raising the sleeve N38 to close thepassage H2 and prevent any substantial flow of pressure fluid throughthe passage H2 into that cylinder while it remains exhausted.

Should one of the cylinders remain in disuse for any reason, thepressure-restoring mechanism would remain in the position shown in Fig.i and it would be impossible for pressure to build up in that cylinderbecause any seepage of the pressure liquid around the sleeve it wouldpass downwardly through the open drain tube I04, and any seepage ofpressure fluid through the three-position valve and into the cylindercould pass out through the pipe 94 into the drain I04 without producingany lifting of the idle piston [6.

Having thus described my invention What I claim as new and desire tosecure by Letters Patent of the United States is:

1. In a machine for applying pressure to shoe bottoms, the combinationwith a plurality of cylinders and pistons operated in turn by liquidunder pressure to apply pressure to shoe bottoms, of a drain tube foreach cylinder, an auxiliary pressure supply pipe to each cylinder, meansoperated by the pressure in each cylinder to close the drain tube andopen the auxiliary pipe, and means operating when the pressure in thecylinder is relieved for opening the drain tube and closing theauxiliary pipe.

2. In a machine for applying pressure to shoe bottoms, the combinationwith a plurality of cylinders and pistons operated by liquid underpressure, of a drain tube from each cylinder, an auxiliary supply pipeto each cylinder, and means operated by pressure in each cylinder toclose the drain tube and open the auxiliary pipe.

3. A pressure-restoring device for hydraulic cylinders comprising a pipeleading from a cylinder, a drain tube connected therewith, apressure-supply pipe connected to both the cylinder pipe and the draintube, a sliding sleeve arranged to close the supply pipe opening whilepermitting communication from the cylinder pipe to the drain tube, aplunger passing loosely through the sleeve and having an end formed andarranged to close the drain tube opening, and a spring arranged tomaintain the sleeve in position to close the pressure supply pipe and tohold the plunger in position to maintain the drain tube open, the rushof pressure fluid from the cylinder acting to move the sleeve andplunger against the spring causing the sleeve to open the supply pipeand the plunger to close the drain tube.

4. A pressure-restoring device for hydraulic cylinders comprising a pipeleading from a cylinder, a drain tube connected therewith, a pressuresupply pipe connected to both the cylinder pipe and the drain tube, acheck valve in the supply pipe permitting passage of liquid to thecylinder pipe, a sliding sleeve arranged to close the supply pipeopening while permitting communication from the cylinder pipe to thedrain tube, a plunger passing loosely through the sleeve and having ahead engaging the sleeve and an end formed and arranged to close thedrain tube opening, and a spring arranged to maintain the sleeve in aposition to close the supply pipe and to hold the plunger away from thedrain tube opening, the construction being such that a rush of pressureliquid from the cylinder will act to move the sleeve and plunger againstthe spring and cause the sleeve to open the supply pipe and the plungerto close the drain pipe.

5. A machine for applying pressure to shoe bottoms comprising aplurality of pads arranged upon a carrier movable to present the pads inturn at an operating station, means pressing each shoe on its padcomprising a cylinder and piston operated by liquid under pressure,means at the operating station to cause pressure to be applied to thecylinder at that station and to be exhausted from the cylinder at thenext station thereto, and a device piped to each cylinder and having anauxiliary pressure supply pipe, a drain tube and a plunger operated bythe pressure in the cylinder to close the drain tube and to open theauxiliary pipe whereby when pressure is applied to any cylinder theother cylinders under pressure will receive liquid through the auxiliarysupply pressure pipe if the pressure therein has fallen and when acylinder has been exhausted the auxiliary pipe will be closed and thedrain tube opened.

6. A machine for applying pressure to shoe bottoms comprising aplurality of pads arranged upon a carrier movable to present the pads inturn at an operating station, means for pressing each shoe on its padcomprising a cylinder and piston operated by liquid under pressure,means at the operating station-to cause pressure to be applied to thecylinder at that station and to be relieved from the cylinder at thenext station thereto, a valve mechanism piped to each cylinder andhaving a liquid pressure supply pipe, a drainage tube, and aspring-sustained sliding valve normally closing the pressure supply pipeand opening the drain tube, said valve being operated against its springby the cylinder pressure to closethe drain tube and open the supply pipewhereby when pressure is applied to any cylinder the other cylindersunder pressure will receive an auxiliary supply of pressure liquidthrough the supply pipes and when a cylinder has been exhausted itssupply pipe will be closed and its drain pipe opened.

7. A machine for applying pressure to shoe bottoms having, incombination, a plurality of pads arranged upon a carrier movable topresent the pads in turn at an operating station, means for pressingeach shoe on its pad comprising a cylinder, a piston operated by liquidunder pressure, means at the operating station to cause pressure to beapplied to the cylinder at that station and to be exhausted from thecylinder next to come to that station and auxiliary means connected toeach cylinder comprising a pressure supply pipe, a drain tube and meansoperated by the cylinder pressure for closing the drain tube and openingthe pressure supply pipe whereby when pressure is applied to anycylinder any of the other cylinders which are under approximately theirinitial pressure will have the initial pressure restored and whenpressure on any cylinder has been relieved that cylinder will receive nopressure and the drain tube will be opened to carry away any liquidentering the cylinder by reason of leakage or seepage.

VERNON H. MEYER.

